Jobs has been receiving treatment for an undisclosed condition at the Stanford Cancer Center in Palo Alto. One photo shows him sucking on what appeared to be lollipop. Cancer patients are often given medicine-laden lollipops to alleviate pain associated with treatment.

In 2004, Jobs, 56, was diagnosed with pancreatic cancer. The co-founder of Apple underwent a liver transplant in 2009 and appeared to have recovered.

Speculation about his health continued this year. In January, Jobs announced emailed employees to announce he was taking another medical leave of absence. In March, however, he surprisingly took to the stage to launch the iPad2.